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Elastic packing film

A packaging film and elastic technology, applied in the field of elastic packaging film, can solve problems such as large elastic deformation

Inactive Publication Date: 2003-03-12
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although these films have good shape recovery properties, the elastic deformation is too large
Therefore, when a plastic tray containing food is packed by an automatic packaging machine with a film, the film bends inward due to elastic deformation, causing the packaging machine to stop.

Method used

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  • Elastic packing film

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0108] An elastic packaging film with a total thickness of 18 microns comprising a 6 micron thick surface layer, a 6 micron thick center layer and another 6 micron thick surface layer was produced in the same manner as Example 1 except that, using Low-density polyethylene (Sumikasenl F200-0, manufactured by Sumitomo Chemical Co., Ltd.; melt flow rate: 2 g / 10 min, density: 0.923 g / cm 3 ) was used as the surface layer instead of ethylene-butene-1 copolymer, This three-layer film with the center layer sandwiched between the two surface layers was fed into a three-layer T-die film processing device (manufactured by Mitsubishi Heavy Industries, Ltd.), and was heated at a die temperature of 240°C and a chill roll temperature of 30°C. processing of thin films. Table 1 shows the results of measurements performed on the obtained films. Example 3

example 3

[0109] An elastic packaging film with a total thickness of 15 microns comprising a 5 micron thick surface layer, a 5 micron thick center layer and another 5 micron thick surface layer was produced in the same manner as Example 1 except that, using Ethylene vinyl acetate copolymer (Evatate H2081, manufactured by Sumitomo Chemical Co., Ltd., melt flow rate: 2 g / 10 minutes, ethylene unit content: 85% by weight, ethylene acetate unit content: 15% by weight) as the surface layer, Instead of the ethylene-butene-1 copolymer, Table 1 shows the results of measurements on the obtained films. Example 4

example 4

[0110] An elastic packaging film having a total thickness of 15 microns, comprising a surface layer 5 microns thick, a center layer 5 microns thick and another surface layer 5 microns thick, was produced in the same manner as in Example 1 except that, Using ethylene vinyl acetate copolymer (Evatata H2081, manufactured by Sumitomo Chemical Co., Ltd.; melt flow rate: 2 g / 10 minutes, ethylene unit content: 85% by weight, vinyl acetate content: 15% by weight) as the surface layer, instead of ethylene-butene-1 copolymer. A resin containing 50% of a propylene-based block copolymer and 50% of a propylene-butene-1 copolymer (Ubtae UT2780, manufactured by Ube Rehisen Co., Ltd., propylene unit content: 65%, butene-1 unit content: 35%) was used The mixture is an amorphous polyolefin obtained by melt-blending in a Banbury mixer as a center layer instead of a propylene-based block copolymer. Table 1 shows the results of measurements on the obtained films. Example 5

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Abstract

A film containing a first layer containing a propylene-based block copolymer (a) obtainable by forming 40 to 85% by weight of a propylene-ethylene copolymer portion (A) having a content of repeating unit derived from ethylene of 1.5 to 6.0% by weight in a first step, and then forming 15 to 60% by weight of a propylene-ethylene copolymer portion (B) having a content of repeating unit derived from ethylene of 7 to 17% by weight in a second step, the intrinsic viscosity of portion (B) being 2 to 5 dl / g, and the ratio of the intrinsic viscosity of portion (B) to the intrinsic viscosity of portion (A) being 0.5 to 1.8, and a second layer containing a polyethylene type resin (b) laminated on at least one surface of the first layer, has a good balance between heat resistance, flexibility, mechanical strength, transparency, cuttability, original-shape resuming property and other desirable properties, and is suitably used for wrapping materials such as foods.

Description

technical field [0001] The present invention relates to an elastic packaging film, in particular to an elastic packaging film with excellent heat resistance, flexibility, mechanical strength, transparency, divisibility and original shape recovery properties, used alone or together with plastic trays, etc. Flexible packaging food. Background technique [0002] For elastic packaging films used alone or together with plastic trays and the like for elastically packaging foods such as fruits, vegetables, fresh fish, fresh meat, daily dishes, etc., vinyl chloride resin films are mainly used. Recently, in order to solve safety and environmental sanitation problems (such as preventing carcinogens due to incineration), polyethylene-type resin films such as low-density polyethylene, ethylene-vinyl acetate copolymer, etc. have replaced traditional vinyl chloride resin films and have been effectively develop. [0003] However, when low-density polyethylene or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32C08F297/08C08L23/02C08L53/00
CPCC08F297/083Y10S428/91C08L53/00B32B27/32C08L23/02Y10T428/2826Y10T428/31913Y10T428/31928C08L2666/02C08L2666/24B32B2439/70B32B2038/0028B32B27/08B32B2323/00B32B2307/306
Inventor 林田晴雄白谷英助山本育央市毛昭弘
Owner SUMITOMO CHEM CO LTD
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